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PDF LMH0384 Data sheet ( Hoja de datos )
| Número de pieza | LMH0384 | |
| Descripción | 3 Gbps HD/SD SDI Extended Reach And Configurable Adaptive Cable Equalizer | |
| Fabricantes | National Semiconductor Corporation | |
| Logotipo |  |
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LMH0384
May 11, 2009
3 Gbps HD/SD SDI Extended Reach and Configurable
Adaptive Cable Equalizer
General Description
The LMH0384 3 Gbps HD/SD SDI Extended Reach and Con-
figurable Adaptive Cable Equalizer is designed to equalize
data transmitted over cable (or any media with similar disper-
sive loss characteristics). The equalizer operates over a wide
range of data rates from 143 Mbps to 2.97 Gbps and supports
SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M standards.
The LMH0384 includes active sensing features and design
enhancements including longer cable equalization, lower out-
put jitter, configurable pin mode and SPI modes, a power-
saving sleep mode, and programmable output common mode
voltage and swing. The LMH0384 implements DC restoration
to correctly handle pathological data conditions.
The LMH0384 includes an auto sleep mode to power down
the device when no input signal is detected. Other features
include separate carrier detect and output mute pins which
may be tied together to mute the output when no input signal
is present, and a programmable mute reference which may
be used to mute the output at a selectable level of signal
degradation.
The LMH0384 supports two modes of operation. In pin mode
(non-SPI mode) the LMH0384 is footprint compatible with the
LMH0344 and legacy SDI equalizers. In the optional SPI
mode, the LMH0384 provides register access to all of its fea-
tures along with a cable length indicator, programmable out-
put common mode voltage and swing, and launch amplitude
optimization.
The device is available in a 16-pin LLP package.
Features
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M compliant
■ Supports DVB-ASI at 270 Mbps
■ Wide range of data rates: 143 Mbps to 2.97 Gbps
■ Equalizes up to 140 meters of Belden 1694A at 2.97 Gbps,
up to 200 meters of Belden 1694A at 1.485 Gbps, or up to
400 meters of Belden 1694A at 270 Mbps
■ Power save mode with auto sleep control (35 mW typical
power consumption in power save mode)
■ Optional SPI register access
■ Manual bypass and output mute with a programmable
threshold
■ Internally terminated 100Ω LVDS outputs with SPI
programmable output common mode voltage and swing
■ Programmable launch amplitude optimization in SPI mode
■ Cable length indicator in SPI mode
■ Single 3.3V supply operation
■ 16-pin LLP package
■ Industrial temperature range: −40°C to +85°C
■ Footprint compatible with the LMH0344, LMH0044, and
LMH0074 in pin mode.
Applications
■ SMPTE 424M, SMPTE 292M, SMPTE 344M, and SMPTE
259M serial digital interfaces
■ Serial digital data equalization and reception
■ Data recovery equalization
Typical Application (Pin Mode)
© 2009 National Semiconductor Corporation 300830
30083001
www.national.com
1 page  
wwCwo.DnatanSehecett4iUo.cnomDiagrams
Pin Mode (non-SPI) / SPI_EN = GND / LMH0344 Compatible
SPI Mode / SPI_EN = VCC
30083003
30083007
The exposed die attach pad is a negative electrical terminal for this device. It should be connected to the negative power supply voltage.
16-Pin LLP
Order Number LMH0384SQ
See NS Package Number SQB16A
Pin Descriptions – Pin Mode (non-SPI) / SPI_EN = GND / LMH0344 Compatible
Pin Name
1 VEE
2 SDI
3 SDI
4 SPI_EN
5 AEC+
6 AEC-
I/O, Type
Ground
I, SDI
I, SDI
I, LVCMOS
I/O, Analog
I/O, Analog
Description
Negative power supply (ground).
Serial data true input.
Serial data complement input.
SPI register access enable. This pin has an internal pulldown.
H = SPI register access mode.
L = Pin mode.
AEC loop filter external capacitor (1µF) positive connection.
AEC loop filter external capacitor (1µF) negative connection.
5 www.national.com
5 Page 
wwAwp.DpataliScheaett4iUo.cnomInformation
APPLICATION CIRCUIT (SPI MODE)
Figure 8 shows the application circuit for the LMH0384 in SPI
mode.
FIGURE 8. Application Circuit (SPI Mode)
30083017
REPLACING THE LMH0344
In pin mode, the LMH0384 is a drop-in replacement for the
LMH0344SQ SDI cable equalizer. When replacing an
LMH0344 with an LMH0384, it is important to consider the
following points:
1. The LMH0384 auto sleep function is mapped to pin 12
which is a ground pin on the LMH0344SQ. When this pin
is grounded on the LMH0384, the auto sleep function is
disabled. To enable auto sleep mode on the LMH0384,
pin 12 must be pulled high.
2. Pin 4 and pin 9 on the LMH0344SQ are true ground pins.
For the LMH0384, pin 4 and pin 9 may be driven logic
low in pin mode (they do not require a true ground
connection).
3. The LMH0384 has lower input capacitance than the
LMH0344 which allows for improved input return loss.
The input return loss network may need to be modified.
In most cases, the LMH0384 should provide superior
input return loss.
4. The LMH0384 default output common mode voltage is
different than that of the LMH0344. In most cases, this
should not cause an issue. The LMH0384 and LMH0344
outputs can both be DC coupled to National's SDI
reclockers and cable drivers. In addition, the LMH0384
output can be DC coupled to LVDS and other inputs that
require lower input common mode voltages than the
LMH0344. The LMH0384 output common mode voltage
is adjustable via the SPI.
PCB LAYOUT RECOMMENDATIONS
For information on layout and soldering of the LLP package,
pease refer to the following application note: AN-1187,
“Leadless Leadframe Package (LLP).”
The SMPTE 424M, 292M, and 259M standards have strin-
gent requirements for the input return loss of receivers, which
essentially specify how closely the input must resemble a
75Ω network. Any non-idealities in the network between the
BNC and the equalizer will degrade the input return loss. Care
must be taken to minimize impedance discontinuities be-
11 www.national.com
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| PDF Descargar | [ Datasheet LMH0384.PDF ] | |
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